office-gobmx/compilerplugins/clang/unusedfieldsremove.cxx
Luboš Luňák b1c14c30ba fix various warnings in compilerplugins
These are triggered when using llvm-config --cxxflags for building,
and sometimes there's -Werror. The warnings were mostly unused
variables because of being used only in assert(), or default case
in switch that covers all enums (it's better to not handle default
to get warning if a case is not handled).

Change-Id: I0ecdd1f27390aadf033852b0d1ee0ca424ae3c37
Reviewed-on: https://gerrit.libreoffice.org/80317
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>
2019-10-07 21:56:55 +02:00

136 lines
4.2 KiB
C++

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#if !defined _WIN32 //TODO, #include <sys/mman.h>
#include <cassert>
#include <string>
#include <iostream>
#include "plugin.hxx"
#include <sys/mman.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#include <assert.h>
#include <cstring>
/**
This is intended to be run as the second stage of the "unusedfields" clang plugin.
*/
namespace {
class UnusedFieldsRemove:
public loplugin::FilteringRewritePlugin<UnusedFieldsRemove>
{
public:
explicit UnusedFieldsRemove(loplugin::InstantiationData const & data);
~UnusedFieldsRemove();
virtual void run() override { TraverseDecl(compiler.getASTContext().getTranslationUnitDecl()); }
bool VisitFieldDecl( const FieldDecl* var );
private:
// I use a brute-force approach - mmap the results file and do a linear search on it
// It works surprisingly well, because the file is small enough to fit into L2 cache on modern CPU's
size_t mmapFilesize;
int mmapFD;
char* mmappedData;
};
size_t getFilesize(const char* filename)
{
struct stat st;
stat(filename, &st);
return st.st_size;
}
UnusedFieldsRemove::UnusedFieldsRemove(loplugin::InstantiationData const & data): FilteringRewritePlugin(data)
{
static const char sInputFile[] = SRCDIR "/result.txt";
mmapFilesize = getFilesize(sInputFile);
//Open file
mmapFD = open(sInputFile, O_RDONLY, 0);
assert(mmapFD != -1);
//Execute mmap
mmappedData = static_cast<char*>(mmap(NULL, mmapFilesize, PROT_READ, MAP_PRIVATE, mmapFD, 0));
assert(mmappedData != NULL);
}
UnusedFieldsRemove::~UnusedFieldsRemove()
{
//Cleanup
int rc = munmap(mmappedData, mmapFilesize);
assert(rc == 0);
(void)rc;
close(mmapFD);
}
std::string niceName(const FieldDecl* fieldDecl)
{
return fieldDecl->getParent()->getQualifiedNameAsString() + " " +
fieldDecl->getNameAsString();
}
bool UnusedFieldsRemove::VisitFieldDecl( const FieldDecl* fieldDecl )
{
if (rewriter == nullptr) {
return true;
}
if (ignoreLocation(fieldDecl)) {
return true;
}
// ignore stuff that forms part of the stable URE interface
if (isInUnoIncludeFile(compiler.getSourceManager().getSpellingLoc(
fieldDecl->getCanonicalDecl()->getLocation()))) {
return true;
}
// don't mess with templates
/* if (isa<CXXRecordDecl>(fieldDecl->getParent())) {
if (dyn_cast<CXXRecordDecl>(fieldDecl->getParent())->getDescribedClassTemplate() != nullptr) {
return true;
}
}
*/
std::string aNiceName = " " + niceName(fieldDecl) + "\n";
const char *aNiceNameStr = aNiceName.c_str();
char* found = std::search(mmappedData, mmappedData + mmapFilesize, aNiceNameStr, aNiceNameStr + strlen(aNiceNameStr));
if(!(found < mmappedData + mmapFilesize)) {
return true;
}
SourceRange replaceRange(fieldDecl->getSourceRange());
// sometimes the declaration has a semicolon just after it, and it's much neater to remove that too.
if (rewriter->getRewrittenText(SourceRange(replaceRange.getEnd(), replaceRange.getEnd().getLocWithOffset(1))) == ";") {
replaceRange.setEnd(replaceRange.getEnd().getLocWithOffset(1));
}
// remove leading spaces
while (rewriter->getRewrittenText(SourceRange(replaceRange.getBegin().getLocWithOffset(-1), replaceRange.getBegin())) == " ")
{
replaceRange.setBegin(replaceRange.getBegin().getLocWithOffset(-1));
}
if (!replaceText(replaceRange, "")) {
report(
DiagnosticsEngine::Warning,
"Could not remove unused field (" + niceName(fieldDecl) + ")",
compat::getBeginLoc(fieldDecl))
<< fieldDecl->getSourceRange();
}
return true;
}
loplugin::Plugin::Registration< UnusedFieldsRemove > X("unusedfieldsremove", false);
}
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */